I have heard a number of questions about wheels and tires recently and so I thought I would include the section in the (SCCA) rules about them here for your information:
13.3 TIRES
Tires may be replaced with any size that fit the allowable wheels and fender wells without modification. Tires may be excluded for, but not limited to, low volume production, extensive availability limitations, and specialty design.
Tires must meet the following requirements to be eligible for use in Street category. No tire model will be eligible for Solo® competition until it meets all requirements of this Section. Tire models not meeting the requirements
by April 30 are not eligible for Solo® competition until after the Solo® National Championships of the year.
A. Specifications1. Minimum UTQG Treadwear Grade of 200.
2. Minimum molded tread depth of 7/32” as specified by the manufacturer.
3. Listed in a current year or prior 2 years of the “Tire Guide®” and/or the “Tread Design Guide®” (
www.tireguides.com).
4. US Department of Transportation (DOT) approval.
5. Tires must be designed for highway use on passenger cars.
B. Eligibility Requirements – The following are prerequisites before a tire can be used in competition at National Solo® events.
1. Tire availability – Tires are considered available when competitors can take possession through retail channels. Pre-orders are not considered available.
2. Tires must be equally available to all competitors. Tires that are in short supply do not specifically violate Section 13.3. Extensive shortages may result in the tire being placed on the exclusion list until supply is replenished.
Tire variations differing from standard specification, delivered only on a limited basis, or only to selected competitors may not be used.
62 — 2017 SCCA® National Solo® Rules
13. Street3. Tire models must have tires available in at least 4 rim diameters and in at least 6 sizes which meet these requirements.
4. Material Change – Tires which previously met the eligiblity requirements that undergo a significant compound change, tread pattern change, or other significant redesign reset the requirement for eligibility described in Section 13.3.B.
5. A tire model which was previously allowed by these rules continues to be eligible for competition until specifically disallowed.
6. Re-introduction – Models that were once discontinued will be considered a new model once reintroduced and must meet all the requirements of Section 13.3.
C. Other1. Any tire which is OE on a car eligible for Street Category may be used on that car in Regional Solo® events. OE tires must meet all requirements of Section 13.3 to be eligible for National Solo® events.
2. Tires may be shaved evenly and parallel to the axis of rotation, but may not otherwise be siped, grooved, or modified.
3. No recap and/or retread tires may be used.
4. The tire must not appear on the following list, which may be altered at any time by the SEB upon notification of membership.
• No tire models are currently listed.
13.4 WHEELSAny type wheel may be used provided it complies with the following:
A. It is the same width as standard and as installed it does not have an offset more than ±7.00 mm (±0.275”) from a standard wheel for the car. The resultant change in track dimensions is allowed.
B. Wheel (rim) diameter may be increased or decreased 1” from the standard part.
Wheel spacers are permitted provided the resultant combination complies with the offset requirements of this Section. On vehicles supplied with an OE wheel spacer, the wheel spacer shall be considered as a part of the wheel.
Wheel studs, lug nuts, valve stems (including pressure-relief types), and/or bolt length may be changed. Wheel bolts may be replaced with studs and nuts but the number of fasteners may not be changed. Tire pressure monitoring
sensors may be removed.
Centerlock/Spline Drive/Knock-off type hubs may be converted to lug type hubs provided the resultant combination complies with the offset requirements
of this Section.
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), Tom Kerns, SM from Edmonton who has been running with us quite a bit over the last few years (blk GTR last weekend), and Sera and Richard Bonham in the FStreet BMW M3.